ROCK FILES

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For quite some time now I have been an avid rock collector. It amazes me what the earth can produce and all the beautiful colours and mixtures of various gemstones and minerals. I have been collecting rocks and stones now for about 10 years and have about 150 pieces of various sizes. I thought that I would share with you a bit of what I have learnt along the way, and some gorgeous pictures of all the little earth gems that I have.

Here are some definitions of common terms:

Conchoidal fractures: Often results in a curved breakage surface that resembles ripples or waves across the surface of the stone. Similar to when you drop a stone in a lake. These ‘ripples’ are basically evidence of shock waves through the stone at the time of breakage. Glass, Obsidian, Beryl and Chrysoprase all break in this manner.

Vitreous Luster: Glass-like appearance.

Pseudomorph: A mineral that chemically repaces another without having an effect on the external form of the original material

Cryptocrystalline Structure: The crystalline structure is only visible when magnified.

Photo: Angelite, Selenite and Banded Botswana Agate